短文改错

增加：在缺词处加一个漏词符号（ˆ）, 并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线, 并在该词下面写出修改后的词。

注意:1.每处错误及修改均仅限一词;2.只允许修改10处，多者（从第11处起）不计分

    Having a good teacher do mean a lot to us students and I am lucky enough to have the one ----Miss Brown, my English teacher.

    Miss Brown is a charming lady always worn a big smile on her face. In the first class she introduced her and then asked us to say something about ourselves with English. When it was my turn, I felt too shy and fearful that I didn't dare to say a word. She came up to me and said, “Don't afraid. You can make it. Just have a try.” At last, I did it quite good. She praised me for that I had done.

    Never shall I forgot my first English class in senior high school.

原始大气层里不含（   ）